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Which of the following can be associated with the concept of Lanthanoid contraction?

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Size of $Zr = Hf$

Shielding of one 4f electron by another is less, than that of one d-electron by another

Similar chemical and physical properties of $Nb$ and $Ta$

All of the above

answer is D.

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Detailed Solution

$Zr$ and $Hf$ have atomic radiuses of 206 pm and 208 pm, respectively.

The inadequate sheathing effect of one 4f electron by another in the subshell is the cause of lanthanoid contraction.

The quantity of valence electrons and the characteristics of $Nb$ and $Ta$ are comparable. We refer to them as chemical twins.

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